Wow..i didnt see the gasket pic

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77 frt 87 rr

good start.. better fat than lean but damn!!! Smoked that head gasket pretty quick

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I'll start with those jets.

Do u have a pic of a spark plug?  Maybe u have a water problem..

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Wow!! Id have the head checked just because.. did ur machine shop check the deck and surface the heads when they put it together? U have head bolts or studs? Clearly there was a problem.. not convinced it was a carb problem..

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Your head gaskets, acting like a fuse, saved your engine from detonating itself to death.

It would really help to see pictures of the sooting on your pistons and combustion chambers.  Reading the soot pattern can provide insight into what is actually happening inside the engine.

I'm thinking along the same lines as Aquaholic in that it is not entirely a carb lean condition.  You are building a lot of cylinder pressure at that RPM and your combination.

You need to spend some time creeping up on your final tune.  What you have now is not plug-n-play.

Sorry to put it bluntly.  I know what it is like to be on a tight budget and being excited for some seat time.  Throwing super wazoo carb tuning capabilities at it is cool and all,but you still need to be able to tune it or you are heading for a nuclear meltdown.

Post up pictures of pistons, combustion chambers, and spark plugs.

Was the cam installed advanced?

Someone duggested MLS head gaskets but now I'D be afraid of it holding it togeger and blowing a piston. Should I shim the gasket?

My understanding is I was way too lean and too much timing. I want to be closer to where I should be and not blow this thing up.

. Correct me if I'm wrong please. I see some big problems that needs the attention of some knowledgeable people to help you. If I remember right everyone said that it was a bad combo from the get go. At this point you need help not a guess. If your not sure about your timing or your lean condition find someone that is.  Sorry to put it this way but your builder that new everything needs to help out before it's too late. I hope the best and hate to see this happen to anyone good luck.


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He feels that 10.5:1 compression was going to be fine

Builder, old jet boat guy, and Ron Blanchard (carb guy) said the 750 vac sec could be made to work.

Indeed it can.  But I think it is not the root cause of your problem.  It may be lean, easily corrected.  I think too much timing, also easily corrected.  I think way too much cylinder pressure.

Is this at your house?  Offer still stands to come calc out your compression ratio.

Yes. It is at my house.

When we build a new engine, the timing starts in the low 30's and typically fat as hell. It is not unheard of to start two steps fat and we run 2% Marvel oil in the gas.

From there we start playing with timing and then working on the fuel. Fuel is always last, then reevaluate the timing.

FYI

GT